Anonymous Anonymous

27-10-2014
Mathematics

Answered

What is the value of a in the equation 3a + b = 54, when b = 9?

15

18

21

27

Verified Answer :

mariamikayla mariamikayla

27-10-2014

\(3a+b=54 \\\\ 3a+9=54 \\\\ 3a=54-9 \\\\ 3a= 45 \\\\ \boxed{a=\frac{45}{3}\to15}\)

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27-10-2014

\(\left \{ {{3a+b=54} \atop {b=9}} \right. \\\\Substitution\\\\ 3a+9=54\ \ \ | subtract\ 9\\\\3a=45\ \ \ | divide\ by\ 3\\\\ a=15\\\\ b=9\)

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